基于USRP的多小区认知无线电通信演示系统的设计与实现-通信与信息系统专业论文.docx

摘 要 随着无线通信技术的发展，频谱资源的使用日益频繁，无线频谱的紧缺成为 限制无线通信发展的新瓶颈。认知无线电技术能够感知频谱环境，根据频谱环境 的变化实时地调整传输参数，在不干扰授权用户的条件下使用空闲的授权频谱， 从而有效解决频谱资源缺乏的问题，成为近年来无线通信领域的一个研究热点。 本文以认知无线电基本理论为指导，设计并使用 USRP 软件无线电平台实现了一 种多小区认知无线电通信演示系统，将频谱感知、频谱分配、频谱切换等认知无 线电关键技术融入实际通信系统之中，通过对频谱资源的有效管理和利用，提高 频谱利用率。 本文首先简要介绍了认知无线电技术的研究现状及基本原理。其次，通过对 现有的认知无线电系统的研究和分析，设计出了多小区认知无线电通信演示系统 的具体实现方案，并使用 USRP 软件无线电平台和 GNU Radio 软件包对该方案进 行了实现。最后，通过实际的系统工作测试，验证了设计方案的可行性。实现后 的系统为认知无线电技术的理论研究提供了可实际验证的平台。 关键词：认知无线电 USRP GNU Radio 频谱管理 Abstract With the development of wireless communication technology, spectrum resources have been increasingly employed. The scarcity of spectrum restricts the sustaining growth of wireless communication. By sensing the spectrum environment and adjusting the transmission parameters in real time, a cognitive radio can use the idle licensed spectrum without disturbing the authorized users, which will relief the scarcity of spectrum efficiently and makes itself a hot topic in wireless communication recently. Based on the basic theory of cognitive radio, this paper designs and implements a multi-cell cognitive radio communication demonstration system using USRP, a software radio platform, which involving the key technologies including spectrum sensing, spectrum allocation and spectrum handoff. Through the effective spectrum management function, the system will show its promotion on spectrum utilization. This paper firstly introduces the current research and basic concept of cognitive radio. Then, by the research and analysis of the existing cognitive radio systems, the detailed design of the multi-cell cognitive radio communication demonstration system is described, along with its specific implementation by USRP software radio platform and GNU Radio packages. Finally, the feasibility of the design is verified via an actual test. The implemented system will offer a practical testing platform for the theoretical study of cognitive radio technology. Keywords: cognitive radio USRP GNU Radio spectrum managemen